LG PT-53A82 Red Power Light then doesn't Power Up Read more: LG PT-53A82 Red Power Light

LG PT-53A82 Red Power Light then doesn't Power Up Read more: LG PT-53A82 Red Power Light

Hi all This is my very first Thread First of all i wish all the best for all the guys who are experienced and take their time to help peoples like me with a great Hope of repair and make dead electronics alive...Thank You so so much

I came here with a great Hopes after searching tremendous hours for the solution i wish i find here

I got LG rear projection TV model :- PT-53A82 My TV when i plug into the socket it just gives Red Power Light and when i press TV button to "On" the TV that red Power Light Just Dims a bit for few seconds (As if it wanted to take some load to start) then comes again to Normal red light But there is no picture no sound nothing just red power light.. I can also hear some sound like "click" something like that ...

I took smps out and was verifing it below is what i observed

I checked the voltage and its 220v and then there is one connector which when i "ON" the tv it gives me Voltage of 217v as weel but when the TV is "OFF" it doesn't give me any reading .... Yes i am using multimeter . I attached the Picture Please now guide me for the next step I verified the current is flowing good and i am getting 220v and there are no signs of Bubble top on the capacitors . I wish if i had online capasitense Multimeter tester or ESR but anyway as far as i know visual indications will also work for the capacitors ....

Thank U for your Replay
When i disconnect all other boards connected to smps there is no light at all and no sound from back of the tv.
I just connected the power cable with the two other cable which goes to TV and all other board connections were disconnected and then there is no light .

When i checked transistors by removing the SMPS off the TV i came across a transistor which is of 10m ohms which has no sign of life at all when i used the multimeter setting to 2000k which is 20m i believe .
and there are many other transistors which are more then their regular values and some with no value at all

So should i assume here is the fault and remove them all and change them?
As per capacitors there are no signs of Bubble top on any of them .

There are two Power TR IC's IC801 (STR-F6658B) and PowernTR IC802 (STR83145) which i feel they play an important role in this kind of situation but not so sure about that ..

I was actually thinking it may be a transistor but if it's going to any transistor it's most likely going to be one on a heat sink, one that needs cooling from working so much. Have you tested any of the connections for voltage I'm particularly interested in P611A? If you do have a loading probem you will see less or no voltage where you should see some or it will be there briefly and drop.

I will test each pin with the particular voltage for P811A and get right back to you.
When i press "ON" button , first of all the red light dims and it feels like it need some more power to make it start . I think due to the less power as you have stated the three blub of projection TV doesn't get enough voltage to kickstart and that might be the problem .. Interesting

Today i just sat back and was thinking and said to myself if the load is not able to load correctly that means there is less current then Required ...

And first thing I did was to check the voltages of different Transformer Pins

and i found that non of them gives the correct required Volts . Most of them when i press the "ON" button they reduce them self to zero volts or 1 or 2 volts and that happens when the power light dims as if it need much more power then it is getting..Then when the power light come to normal or in other words it sensed that it will not be able to load up and start the TV then only the voltage of transformer come to almost less the half of required voltages on their pins...

Are you checking the primary or secondary side of the transformer? If you checked the secondary side and have no voltage there probably isn't any voltage coming into the primary side this could be because your checking a transformer that doesn't need to be checked! What was the part number of the transformer that you tested? Always start at the beginning and work your way forward.

It would seem that your problem starts a lot sooner than the transformer if your only getting 220V at connection P814 when you should be getting 275V. I'm looking for a parts list so I can identify some of the components but can't find a manual for that model.

No i meant it was working before 6 months from now..But unfortunately its 6 years old and warranty already expired and the problem is that no one here in my place is good enough to repair it so i have decided to repair it my self

I'm trying to comprehend that part of the schematic that supply's that transformer but am not used to 220 supply I would say that's part of your problem that voltage should be more constant than that and not fluctuating as much.

I tested all pins
Pin first 115v when TV is "Off" it gives = 20volts to 34 volts (Not Stable)
Pin first 115v when TV is "ON" it gives "I assume" value above my multimeter
(My multimeter has last value as 1000V and i assume that pin when TV is "On" gives me value above 1000v "

You should measure the two on the top left of the picture you posted, primary side,using the ground I showed in the picture. I hope you didn't use that ground when testing those pins you circled, secondary windings.

Yup
The upper left point when TV is "On" gives me 700 volts
the other point when TV is "OFF" it gives a very quick run reading 0 then 24 then 30 and back to 0 then 24 then 30
But when TV is "ON" no reading ...

Sorry i had assignment which kept me busy ..
I verified and found that my "Multimeter" is "BAD" i just dont know how.

Anyway i will get the meter today and will continue the project which is really a dream project for me as the TV i had is really no one here is expert to make it alife and that's why i feel you are a God to me and to help me out...